42
SERVICING
SERVICE NUMBERS
S
-1
CHECKING VOLTAGE .........................................................................................................................43
S-2
CHECKING WIRING ............................................................................................................................43
S-3A
THERMOSTAT AND WIRING ..............................................................................................................43
S-3B
HEATING ANTICIPATOR .....................................................................................................................43
S-4
CHECKING TRANSFORMER AND CONTROL CIRCUIT ................................................................44
S-16A
CHECKING AIR CIRCULATOR BLOWER MOTOR ........................................................................44
S-200 CHECKING DUCT STATIC..................................................................................................................45
S-201 CHECKING TEMPERATURE RISE ....................................................................................................46
S-300
CHECKING PRIMARY LIMIT CONTROL ...........................................................................................45
S-302
CHECKING FLAME ROLLOUT CONTROL .......................................................................................46
S-303
INDUCED DRAFT BLOWER MOTOR ...............................................................................................47
S-304
CHECKING GAS VALVE (REDUNDANT) ..........................................................................................47
S-305
CHECKING MAIN BURNERS .............................................................................................................48
S-306
CHECKING ORIFICES ........................................................................................................................48
S-307
CHECKING GAS PRESSURE ............................................................................................................48
S-308
CHECKING HOT SURFACE IGNITOR ..............................................................................................50
S-309
CHECKING FOR FLASHBACK ..........................................................................................................51
S-310
CHECKING PRESSURE SWITCH .....................................................................................................51
S-311
HIGH ALTITUDE APPLICATION (USA) ..............................................................................................51
S-312
CHECKING FOR DELAYED IGNITION ..............................................................................................51
S-313
CHECKING INTEGRATED IGNITION CONTROL BOARDS ..........................................................51
S-314
CHECKING FLAME SENSOR ............................................................................................................52